131
Troubleshooting Using LED Indicators
Section 7-2
7-2-3
Unit Operational Errors
Unit Operational errors are errors which can occur during normal operation,
i.e. after normal startup.
The error determination procedure uses the table below. To determine the
error, first find the status of the RUN LED indicator (left column). Then move
one column to the right and find the status of the ERH LED indicator. Then
move again one column to the right and find the status of the ERC LED indi-
cator. The probable error causes are listed to the right of the third column.
Unit Operational Errors.
Note If operational errors prevent the Unit from functioning correctly, the PRM, BST,
COMM and BF LED indicators will remain OFF.
RUN
ERH
ERC
Probable cause
Correction
Not lit
Not lit
Not lit
Power is not being supplied to the CPU Unit
or the power supply voltage is too low.
Supply power. Make sure that the correct
voltage is being supplied.
The CPU Unit or Backplane is faulty.
Replace the CPU Unit or the Backplane.
The mounting screws on the PROFIBUS-
DP Master Unit are loose (CS Series) or
the sliders are not properly locked into
place (CJ Series).
Tighten the mounting screws to the speci-
fied torque (CS Series) or lock the sliders
into place (CJ Series).
A fatal error has occurred in the Unit, pre-
venting it from running any program.
Restart the CPU Unit. If the problem per-
sists, replace the PROFIBUS-DP Master
Unit.
Lit
A fatal error has occurred in the Unit’s pro-
gram. The appropriate error code is stored
in the error log.error
Restart the CPU Unit. If the problem per-
sists, replace the PROFIBUS-DP Master
Unit.
Lit
Not lit
Not a valid combination during operation.
Lit
Not a valid combination during operation.
Lit
Not lit
Not lit
Unit is functionally correct. If there are still problems, proceed to check on the other LED
indicators.
Lit
A write-verify check failed, while writing the
error log to the non-volatile memory.
Send a ERROR LOG CLEAR FINS com-
mand to the Unit. Restart the Unit.
A write-verify check failed, while writing the
(new) configuration to the non-volatile
memory.
Check the Parameter set in CX-Profibus
and re-download the Parameter sets from
CX-Profibus.
If the problem persists, replace the PROFI-
BUS-DP Master Unit.
Lit
Not Lit
Memory in the CPU Unit is faulty.
Restart the CPU Unit. If the problem per-
sists, replace the CPU Unit.
The CPU Unit is faulty.
Restart the CPU Unit. If the problem per-
sists, replace the CPU Unit.
A cyclic Monitor time out has occurred, i.e a
timeout on exchange of data between the
Unit and the PLC CPU.
Restart the CPU Unit. If the problem per-
sists, replace the PROFIBUS-DP Master
Unit.
Lit
Not a valid combination during operation.
Summary of Contents for SYSMAC CJ1W-PRM21
Page 2: ...iv...
Page 36: ...22 Basic Operating Procedure Section 1 5...
Page 52: ...38 Defining PROFIBUS DP in the Software Section 2 5...
Page 112: ...98 Allocated CIO Area Words Section 4 2...
Page 122: ...108 Command Response Reference Section 5 2...
Page 160: ...146 Replacing the Unit Section 7 8...
Page 174: ...160 Appendix...
Page 180: ...166 I O Data Conversions Appendix D...
Page 186: ...172 Configurator Error and Warning Messages Appendix E...
Page 187: ...173 Index...
Page 188: ...174 Index...
Page 190: ...176 Revision History...